/*
 * FreeRTOS V202107.00
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * https://www.FreeRTOS.org
 * https://github.com/FreeRTOS
 *
 */


/*
 * Tests the extra queue functionality introduced in FreeRTOS.org V4.5.0 -
 * including xQueueSendToFront(), xQueueSendToBack(), xQueuePeek() and
 * mutex behaviour.
 *
 * See the comments above the prvSendFrontAndBackTest() and
 * prvLowPriorityMutexTask() prototypes below for more information.
 */

/* Standard includes. */
#include <stdlib.h>

/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"

/* Demo program include files. */
#include "GenQTest.h"

#define genqQUEUE_LENGTH                      ( 5 )
#define intsemNO_BLOCK                        ( 0 )
#define genqSHORT_BLOCK                       ( pdMS_TO_TICKS( 2 ) )

#define genqMUTEX_LOW_PRIORITY                ( tskIDLE_PRIORITY )
#define genqMUTEX_TEST_PRIORITY               ( tskIDLE_PRIORITY + 1 )
#define genqMUTEX_MEDIUM_PRIORITY             ( tskIDLE_PRIORITY + 2 )
#define genqMUTEX_HIGH_PRIORITY               ( tskIDLE_PRIORITY + 3 )

#ifndef genqMUTEX_TEST_TASK_STACK_SIZE
    #define genqMUTEX_TEST_TASK_STACK_SIZE    configMINIMAL_STACK_SIZE
#endif

#ifndef genqGENERIC_QUEUE_TEST_TASK_STACK_SIZE
    #define genqGENERIC_QUEUE_TEST_TASK_STACK_SIZE    configMINIMAL_STACK_SIZE
#endif
/*-----------------------------------------------------------*/

/*
 * Tests the behaviour of the xQueueSendToFront() and xQueueSendToBack()
 * macros by using both to fill a queue, then reading from the queue to
 * check the resultant queue order is as expected.  Queue data is also
 * peeked.
 */
static void prvSendFrontAndBackTest( void * pvParameters );

/*
 * The following three tasks are used to demonstrate the mutex behaviour.
 * Each task is given a different priority to demonstrate the priority
 * inheritance mechanism.
 *
 * The low priority task obtains a mutex.  After this a high priority task
 * attempts to obtain the same mutex, causing its priority to be inherited
 * by the low priority task.  The task with the inherited high priority then
 * resumes a medium priority task to ensure it is not blocked by the medium
 * priority task while it holds the inherited high priority.  Once the mutex
 * is returned the task with the inherited priority returns to its original
 * low priority, and is therefore immediately preempted by first the high
 * priority task and then the medium priority task before it can continue.
 */
static void prvLowPriorityMutexTask( void * pvParameters );
static void prvMediumPriorityMutexTask( void * pvParameters );
static void prvHighPriorityMutexTask( void * pvParameters );

/*
 * Tests the behaviour when a low priority task inherits the priority of a
 * higher priority task when taking two mutexes, and returns the mutexes in
 * first the same order as the two mutexes were obtained, and second the
 * opposite order as the two mutexes were obtained.
 */
static void prvTakeTwoMutexesReturnInSameOrder( SemaphoreHandle_t xMutex,
                                                SemaphoreHandle_t xLocalMutex );
static void prvTakeTwoMutexesReturnInDifferentOrder( SemaphoreHandle_t xMutex,
                                                     SemaphoreHandle_t xLocalMutex );

#if ( INCLUDE_xTaskAbortDelay == 1 )

    #if ( configUSE_PREEMPTION == 0 )
        #error The additional tests included when INCLUDE_xTaskAbortDelay is 1 expect preemption to be used.
    #endif

/* Tests the behaviour when a low priority task inherits the priority of a
 * high priority task only for the high priority task to timeout before
 * obtaining the mutex. */
    static void prvHighPriorityTimeout( SemaphoreHandle_t xMutex );
#endif

/*-----------------------------------------------------------*/

/* Flag that will be latched to pdTRUE should any unexpected behaviour be
 * detected in any of the tasks. */
static volatile BaseType_t xErrorDetected = pdFALSE;

/* Counters that are incremented on each cycle of a test.  This is used to
 * detect a stalled task - a test that is no longer running. */
static volatile uint32_t ulLoopCounter = 0;
static volatile uint32_t ulLoopCounter2 = 0;

/* The variable that is guarded by the mutex in the mutex demo tasks. */
static volatile uint32_t ulGuardedVariable = 0;

/* Handles used in the mutex test to suspend and resume the high and medium
 * priority mutex test tasks. */
static TaskHandle_t xHighPriorityMutexTask, xMediumPriorityMutexTask;

/* If INCLUDE_xTaskAbortDelay is 1 additional tests are performed, requiring an
 * additional task. */
#if ( INCLUDE_xTaskAbortDelay == 1 )
    static TaskHandle_t xSecondMediumPriorityMutexTask;
#endif

/* Lets the high priority semaphore task know that its wait for the semaphore
 * was aborted, in which case not being able to obtain the semaphore is not to be
 * considered an error. */
static volatile BaseType_t xBlockWasAborted = pdFALSE;

/*-----------------------------------------------------------*/

void vStartGenericQueueTasks( UBaseType_t uxPriority )
{
    QueueHandle_t xQueue;
    SemaphoreHandle_t xMutex;

    /* Create the queue that we are going to use for the
     * prvSendFrontAndBackTest demo. */
    xQueue = xQueueCreate( genqQUEUE_LENGTH, sizeof( uint32_t ) );

    if( xQueue != NULL )
    {
        /* vQueueAddToRegistry() adds the queue to the queue registry, if one
         * is in use.  The queue registry is provided as a means for kernel aware
         * debuggers to locate queues and has no purpose if a kernel aware debugger
         * is not being used.  The call to vQueueAddToRegistry() will be removed
         * by the pre-processor if configQUEUE_REGISTRY_SIZE is not defined or is
         * defined to be less than 1. */
        vQueueAddToRegistry( xQueue, "Gen_Queue_Test" );

        /* Create the demo task and pass it the queue just created.  We are
         * passing the queue handle by value so it does not matter that it is
         * declared on the stack here. */
        xTaskCreate( prvSendFrontAndBackTest, "GenQ", genqGENERIC_QUEUE_TEST_TASK_STACK_SIZE, ( void * ) xQueue, uxPriority, NULL );
    }

    /* Create the mutex used by the prvMutexTest task. */
    xMutex = xSemaphoreCreateMutex();

    if( xMutex != NULL )
    {
        /* vQueueAddToRegistry() adds the mutex to the registry, if one is
         * in use.  The registry is provided as a means for kernel aware
         * debuggers to locate mutexes and has no purpose if a kernel aware
         * debugger is not being used.  The call to vQueueAddToRegistry() will be
         * removed by the pre-processor if configQUEUE_REGISTRY_SIZE is not
         * defined or is defined to be less than 1. */
        vQueueAddToRegistry( ( QueueHandle_t ) xMutex, "Gen_Queue_Mutex" );

        /* Create the mutex demo tasks and pass it the mutex just created.  We
         * are passing the mutex handle by value so it does not matter that it is
         * declared on the stack here. */
        xTaskCreate( prvLowPriorityMutexTask, "MuLow", genqMUTEX_TEST_TASK_STACK_SIZE, ( void * ) xMutex, genqMUTEX_LOW_PRIORITY, NULL );
        xTaskCreate( prvMediumPriorityMutexTask, "MuMed", configMINIMAL_STACK_SIZE, NULL, genqMUTEX_MEDIUM_PRIORITY, &xMediumPriorityMutexTask );
        xTaskCreate( prvHighPriorityMutexTask, "MuHigh", genqMUTEX_TEST_TASK_STACK_SIZE, ( void * ) xMutex, genqMUTEX_HIGH_PRIORITY, &xHighPriorityMutexTask );

        /* If INCLUDE_xTaskAbortDelay is set then additional tests are performed,
         * requiring two instances of prvHighPriorityMutexTask(). */
        #if ( INCLUDE_xTaskAbortDelay == 1 )
            {
                xTaskCreate( prvHighPriorityMutexTask, "MuHigh2", configMINIMAL_STACK_SIZE, ( void * ) xMutex, genqMUTEX_MEDIUM_PRIORITY, &xSecondMediumPriorityMutexTask );
            }
        #endif /* INCLUDE_xTaskAbortDelay */
    }
}
/*-----------------------------------------------------------*/

static void prvSendFrontAndBackTest( void * pvParameters )
{
    uint32_t ulData, ulData2, ulLoopCounterSnapshot;
    QueueHandle_t xQueue;

    #ifdef USE_STDIO
        void vPrintDisplayMessage( const char * const * ppcMessageToSend );

        const char * const pcTaskStartMsg = "Queue SendToFront/SendToBack/Peek test started.\r\n";

        /* Queue a message for printing to say the task has started. */
        vPrintDisplayMessage( &pcTaskStartMsg );
    #endif

    xQueue = ( QueueHandle_t ) pvParameters;

    for( ; ; )
    {
        /* The queue is empty, so sending an item to the back of the queue
         * should have the same effect as sending it to the front of the queue.
         *
         * First send to the front and check everything is as expected. */
        ulLoopCounterSnapshot = ulLoopCounter;
        xQueueSendToFront( xQueue, ( void * ) &ulLoopCounterSnapshot, intsemNO_BLOCK );

        if( uxQueueMessagesWaiting( xQueue ) != 1 )
        {
            xErrorDetected = pdTRUE;
        }

        if( xQueueReceive( xQueue, ( void * ) &ulData, intsemNO_BLOCK ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        /* The data we sent to the queue should equal the data we just received
         * from the queue. */
        if( ulLoopCounter != ulData )
        {
            xErrorDetected = pdTRUE;
        }

        /* Then do the same, sending the data to the back, checking everything
         * is as expected. */
        if( uxQueueMessagesWaiting( xQueue ) != 0 )
        {
            xErrorDetected = pdTRUE;
        }

        ulLoopCounterSnapshot = ulLoopCounter;
        xQueueSendToBack( xQueue, ( void * ) &ulLoopCounterSnapshot, intsemNO_BLOCK );

        if( uxQueueMessagesWaiting( xQueue ) != 1 )
        {
            xErrorDetected = pdTRUE;
        }

        if( xQueueReceive( xQueue, ( void * ) &ulData, intsemNO_BLOCK ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        if( uxQueueMessagesWaiting( xQueue ) != 0 )
        {
            xErrorDetected = pdTRUE;
        }

        /* The data sent to the queue should equal the data just received from
         * the queue. */
        if( ulLoopCounter != ulData )
        {
            xErrorDetected = pdTRUE;
        }

        #if configUSE_PREEMPTION == 0
            taskYIELD();
        #endif

        /* Place 2, 3, 4 into the queue, adding items to the back of the queue. */
        for( ulData = 2; ulData < 5; ulData++ )
        {
            xQueueSendToBack( xQueue, ( void * ) &ulData, intsemNO_BLOCK );
        }

        /* Now the order in the queue should be 2, 3, 4, with 2 being the first
        * thing to be read out.  Now add 1 then 0 to the front of the queue. */
        if( uxQueueMessagesWaiting( xQueue ) != 3 )
        {
            xErrorDetected = pdTRUE;
        }

        ulData = 1;
        xQueueSendToFront( xQueue, ( void * ) &ulData, intsemNO_BLOCK );
        ulData = 0;
        xQueueSendToFront( xQueue, ( void * ) &ulData, intsemNO_BLOCK );

        /* Now the queue should be full, and when we read the data out we
         * should receive 0, 1, 2, 3, 4. */
        if( uxQueueMessagesWaiting( xQueue ) != 5 )
        {
            xErrorDetected = pdTRUE;
        }

        if( xQueueSendToFront( xQueue, ( void * ) &ulData, intsemNO_BLOCK ) != errQUEUE_FULL )
        {
            xErrorDetected = pdTRUE;
        }

        if( xQueueSendToBack( xQueue, ( void * ) &ulData, intsemNO_BLOCK ) != errQUEUE_FULL )
        {
            xErrorDetected = pdTRUE;
        }

        #if configUSE_PREEMPTION == 0
            taskYIELD();
        #endif

        /* Check the data we read out is in the expected order. */
        for( ulData = 0; ulData < genqQUEUE_LENGTH; ulData++ )
        {
            /* Try peeking the data first. */
            if( xQueuePeek( xQueue, &ulData2, intsemNO_BLOCK ) != pdPASS )
            {
                xErrorDetected = pdTRUE;
            }

            if( ulData != ulData2 )
            {
                xErrorDetected = pdTRUE;
            }

            /* Now try receiving the data for real.  The value should be the
             * same.  Clobber the value first so we know we really received it. */
            ulData2 = ~ulData2;

            if( xQueueReceive( xQueue, &ulData2, intsemNO_BLOCK ) != pdPASS )
            {
                xErrorDetected = pdTRUE;
            }

            if( ulData != ulData2 )
            {
                xErrorDetected = pdTRUE;
            }
        }

        /* The queue should now be empty again. */
        if( uxQueueMessagesWaiting( xQueue ) != 0 )
        {
            xErrorDetected = pdTRUE;
        }

        #if configUSE_PREEMPTION == 0
            taskYIELD();
        #endif


        /* Our queue is empty once more, add 10, 11 to the back. */
        ulData = 10;

        if( xQueueSend( xQueue, &ulData, intsemNO_BLOCK ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        ulData = 11;

        if( xQueueSend( xQueue, &ulData, intsemNO_BLOCK ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        if( uxQueueMessagesWaiting( xQueue ) != 2 )
        {
            xErrorDetected = pdTRUE;
        }

        /* Now we should have 10, 11 in the queue.  Add 7, 8, 9 to the
         * front. */
        for( ulData = 9; ulData >= 7; ulData-- )
        {
            if( xQueueSendToFront( xQueue, ( void * ) &ulData, intsemNO_BLOCK ) != pdPASS )
            {
                xErrorDetected = pdTRUE;
            }
        }

        /* Now check that the queue is full, and that receiving data provides
         * the expected sequence of 7, 8, 9, 10, 11. */
        if( uxQueueMessagesWaiting( xQueue ) != 5 )
        {
            xErrorDetected = pdTRUE;
        }

        if( xQueueSendToFront( xQueue, ( void * ) &ulData, intsemNO_BLOCK ) != errQUEUE_FULL )
        {
            xErrorDetected = pdTRUE;
        }

        if( xQueueSendToBack( xQueue, ( void * ) &ulData, intsemNO_BLOCK ) != errQUEUE_FULL )
        {
            xErrorDetected = pdTRUE;
        }

        #if configUSE_PREEMPTION == 0
            taskYIELD();
        #endif

        /* Check the data we read out is in the expected order. */
        for( ulData = 7; ulData < ( 7 + genqQUEUE_LENGTH ); ulData++ )
        {
            if( xQueueReceive( xQueue, &ulData2, intsemNO_BLOCK ) != pdPASS )
            {
                xErrorDetected = pdTRUE;
            }

            if( ulData != ulData2 )
            {
                xErrorDetected = pdTRUE;
            }
        }

        if( uxQueueMessagesWaiting( xQueue ) != 0 )
        {
            xErrorDetected = pdTRUE;
        }

        /* Increment the loop counter to indicate these tasks are still
         * executing. */
        ulLoopCounter++;
    }
}
/*-----------------------------------------------------------*/

#if ( INCLUDE_xTaskAbortDelay == 1 )

    static void prvHighPriorityTimeout( SemaphoreHandle_t xMutex )
    {
        static UBaseType_t uxLoopCount = 0;

        /* The tests in this function are very similar, the slight variations
         * are for code coverage purposes. */

        /* Take the mutex.  It should be available now.  Check before and after
         * taking that the holder is reported correctly. */
        if( xSemaphoreGetMutexHolder( xMutex ) != NULL )
        {
            xErrorDetected = pdTRUE;
        }

        if( xSemaphoreTake( xMutex, intsemNO_BLOCK ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        if( xSemaphoreGetMutexHolder( xMutex ) != xTaskGetCurrentTaskHandle() )
        {
            xErrorDetected = pdTRUE;
        }

        /* This task's priority should be as per that assigned when the task was
         * created. */
        if( uxTaskPriorityGet( NULL ) != genqMUTEX_LOW_PRIORITY )
        {
            xErrorDetected = pdTRUE;
        }

        /* Now unsuspend the high priority task.  This will attempt to take the
         * mutex, and block when it finds it cannot obtain it. */
        vTaskResume( xHighPriorityMutexTask );

        /* This task should now have inherited the priority of the high priority
         * task as by now the high priority task will have attempted to obtain the
         * mutex. */
        if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
        {
            xErrorDetected = pdTRUE;
        }

        /* Unblock a second medium priority task.  It too will attempt to take
         * the mutex and enter the Blocked state - it won't run yet though as this
         * task has inherited a priority above it. */
        vTaskResume( xSecondMediumPriorityMutexTask );

        /* This task should still have the priority of the high priority task as
         * that had already been inherited as is the highest priority of the three
         * tasks using the mutex. */
        if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
        {
            xErrorDetected = pdTRUE;
        }

        /* On some loops, block for a short while to provide additional
         * code coverage.  Blocking here will allow the medium priority task to
         * execute and so also block on the mutex so when the high priority task
         * causes this task to disinherit the high priority it is inherited down to
         * the priority of the medium priority task.  When there is no delay the
         * medium priority task will not run until after the disinheritance, so
         * this task will disinherit back to its base priority, then only up to the
         * medium priority after the medium priority has executed. */
        vTaskDelay( uxLoopCount & ( UBaseType_t ) 0x07 );

        /* Now force the high priority task to unblock.  It will fail to obtain
         *  the mutex and go back to the suspended state - allowing this task to
         *  execute again.  xBlockWasAborted is set to pdTRUE so the higher priority
         *  task knows that its failure to obtain the semaphore is not an error. */
        xBlockWasAborted = pdTRUE;

        if( xTaskAbortDelay( xHighPriorityMutexTask ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        /* This task has inherited the priority of xHighPriorityMutexTask so
         * could still be running even though xHighPriorityMutexTask is no longer
         * blocked.  Delay for a short while to ensure xHighPriorityMutexTask gets
         * a chance to run - indicated by this task changing priority.  It should
         * disinherit the high priority task, but then inherit the priority of the
         * medium priority task that is waiting for the same mutex. */
        while( uxTaskPriorityGet( NULL ) != genqMUTEX_MEDIUM_PRIORITY )
        {
            /* If this task gets stuck here then the check variables will stop
             * incrementing and the check task will detect the error. */
            vTaskDelay( genqSHORT_BLOCK );
        }

        /* Now force the medium priority task to unblock.  xBlockWasAborted is
         * set to pdTRUE so the medium priority task knows that its failure to
         * obtain the semaphore is not an error. */
        xBlockWasAborted = pdTRUE;

        if( xTaskAbortDelay( xSecondMediumPriorityMutexTask ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        /* This time no other tasks are waiting for the mutex, so this task
         * should return to its base priority.  This might not happen straight
         * away as it is running at the same priority as the task it just
         * unblocked. */
        while( uxTaskPriorityGet( NULL ) != genqMUTEX_LOW_PRIORITY )
        {
            /* If this task gets stuck here then the check variables will stop
             * incrementing and the check task will detect the error. */
            vTaskDelay( genqSHORT_BLOCK );
        }

        /* Give the semaphore back ready for the next test.  Check the mutex
         * holder before and after using the "FromISR" version for code coverage. */
        if( xSemaphoreGetMutexHolderFromISR( xMutex ) != xTaskGetCurrentTaskHandle() )
        {
            xErrorDetected = pdTRUE;
        }

        xSemaphoreGive( xMutex );

        if( xSemaphoreGetMutexHolderFromISR( xMutex ) != NULL )
        {
            xErrorDetected = pdTRUE;
        }

        configASSERT( xErrorDetected == pdFALSE );

        /* Now do the same again, but this time unsuspend the tasks in the
         * opposite order.  This takes a different path though the code because
         * when the high priority task has its block aborted there is already
         * another task in the list of tasks waiting for the mutex, and the
         * low priority task drops down to that priority, rather than dropping
         * down to its base priority before inheriting the priority of the medium
         * priority task. */
        if( xSemaphoreTake( xMutex, intsemNO_BLOCK ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        if( uxTaskPriorityGet( NULL ) != genqMUTEX_LOW_PRIORITY )
        {
            xErrorDetected = pdTRUE;
        }

        /* This time unsuspend the medium priority task first.  This will
         * attempt to take the mutex, and block when it finds it cannot obtain it. */
        vTaskResume( xSecondMediumPriorityMutexTask );

        /* This time this task should now have inherited the priority of the
         * medium task. */
        if( uxTaskPriorityGet( NULL ) != genqMUTEX_MEDIUM_PRIORITY )
        {
            xErrorDetected = pdTRUE;
        }

        /* This time the high priority task in unsuspended second. */
        vTaskResume( xHighPriorityMutexTask );

        /* The high priority task should already have run, causing this task to
         * inherit a priority for the second time. */
        if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
        {
            xErrorDetected = pdTRUE;
        }

        /* This time, when the high priority task has its delay aborted and it
         * fails to obtain the mutex this task will immediately have its priority
         * lowered down to that of the highest priority task waiting on the mutex,
         * which is the medium priority task. */
        xBlockWasAborted = pdTRUE;

        if( xTaskAbortDelay( xHighPriorityMutexTask ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        while( uxTaskPriorityGet( NULL ) != genqMUTEX_MEDIUM_PRIORITY )
        {
            /* If this task gets stuck here then the check variables will stop
             * incrementing and the check task will detect the error. */
            vTaskDelay( genqSHORT_BLOCK );
        }

        /* And finally, when the medium priority task also have its delay
         * aborted there are no other tasks waiting for the mutex so this task
         * returns to its base priority. */
        xBlockWasAborted = pdTRUE;

        if( xTaskAbortDelay( xSecondMediumPriorityMutexTask ) != pdPASS )
        {
            xErrorDetected = pdTRUE;
        }

        while( uxTaskPriorityGet( NULL ) != genqMUTEX_LOW_PRIORITY )
        {
            /* If this task gets stuck here then the check variables will stop
             * incrementing and the check task will detect the error. */
            vTaskDelay( genqSHORT_BLOCK );
        }

        /* Give the semaphore back ready for the next test. */
        xSemaphoreGive( xMutex );

        configASSERT( xErrorDetected == pdFALSE );

        /* uxLoopCount is used to add a variable delay, and in-so-doing provide
         * additional code coverage. */
        uxLoopCount++;
    }

#endif /* INCLUDE_xTaskAbortDelay == 1 */
/*-----------------------------------------------------------*/

static void prvTakeTwoMutexesReturnInDifferentOrder( SemaphoreHandle_t xMutex,
                                                     SemaphoreHandle_t xLocalMutex )
{
    /* Take the mutex.  It should be available now. */
    if( xSemaphoreTake( xMutex, intsemNO_BLOCK ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    /* Set the guarded variable to a known start value. */
    ulGuardedVariable = 0;

    /* This task's priority should be as per that assigned when the task was
     * created. */
    if( uxTaskPriorityGet( NULL ) != genqMUTEX_LOW_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Now unsuspend the high priority task.  This will attempt to take the
     * mutex, and block when it finds it cannot obtain it. */
    vTaskResume( xHighPriorityMutexTask );

    #if configUSE_PREEMPTION == 0
        taskYIELD();
    #endif

    /* Ensure the task is reporting its priority as blocked and not
     * suspended (as it would have done in versions up to V7.5.3). */
    #if ( INCLUDE_eTaskGetState == 1 )
        {
            configASSERT( eTaskGetState( xHighPriorityMutexTask ) == eBlocked );
        }
    #endif /* INCLUDE_eTaskGetState */

    /* This task should now have inherited the priority of the high priority
     * task as by now the high priority task will have attempted to obtain the
     * mutex. */
    if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Attempt to set the priority of this task to the test priority -
     * between the idle priority and the medium/high test priorities, but the
     * actual priority should remain at the high priority. */
    vTaskPrioritySet( NULL, genqMUTEX_TEST_PRIORITY );

    if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Now unsuspend the medium priority task.  This should not run as the
     * inherited priority of this task is above that of the medium priority
     * task. */
    vTaskResume( xMediumPriorityMutexTask );

    /* If the medium priority task did run then it will have incremented the
     * guarded variable. */
    if( ulGuardedVariable != 0 )
    {
        xErrorDetected = pdTRUE;
    }

    /* Take the local mutex too, so two mutexes are now held. */
    if( xSemaphoreTake( xLocalMutex, intsemNO_BLOCK ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    /* When the semaphore is given back the priority of this task should not
     * yet be disinherited because the local mutex is still held.  This is a
     * simplification to allow FreeRTOS to be integrated with middleware that
     * attempts to hold multiple mutexes without bloating the code with complex
     * algorithms.  It is possible that the high priority mutex task will
     * execute as it shares a priority with this task. */
    if( xSemaphoreGive( xMutex ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    #if configUSE_PREEMPTION == 0
        taskYIELD();
    #endif

    /* The guarded variable is only incremented by the medium priority task,
     * which still should not have executed as this task should remain at the
     * higher priority, ensure this is the case. */
    if( ulGuardedVariable != 0 )
    {
        xErrorDetected = pdTRUE;
    }

    if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Now also give back the local mutex, taking the held count back to 0.
     * This time the priority of this task should be disinherited back to the
     * priority to which it was set while the mutex was held.  This means
     * the medium priority task should execute and increment the guarded
     * variable.   When this task next	runs both the high and medium priority
     * tasks will have been suspended again. */
    if( xSemaphoreGive( xLocalMutex ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    #if configUSE_PREEMPTION == 0
        taskYIELD();
    #endif

    /* Check the guarded variable did indeed increment... */
    if( ulGuardedVariable != 1 )
    {
        xErrorDetected = pdTRUE;
    }

    /* ... and that the priority of this task has been disinherited to
     * genqMUTEX_TEST_PRIORITY. */
    if( uxTaskPriorityGet( NULL ) != genqMUTEX_TEST_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Set the priority of this task back to its original value, ready for
     * the next loop around this test. */
    vTaskPrioritySet( NULL, genqMUTEX_LOW_PRIORITY );
}
/*-----------------------------------------------------------*/

static void prvTakeTwoMutexesReturnInSameOrder( SemaphoreHandle_t xMutex,
                                                SemaphoreHandle_t xLocalMutex )
{
    /* Take the mutex.  It should be available now. */
    if( xSemaphoreTake( xMutex, intsemNO_BLOCK ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    /* Set the guarded variable to a known start value. */
    ulGuardedVariable = 0;

    /* This task's priority should be as per that assigned when the task was
     * created. */
    if( uxTaskPriorityGet( NULL ) != genqMUTEX_LOW_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Now unsuspend the high priority task.  This will attempt to take the
     * mutex, and block when it finds it cannot obtain it. */
    vTaskResume( xHighPriorityMutexTask );

    #if configUSE_PREEMPTION == 0
        taskYIELD();
    #endif

    /* Ensure the task is reporting its priority as blocked and not
     * suspended (as it would have done in versions up to V7.5.3). */
    #if ( INCLUDE_eTaskGetState == 1 )
        {
            configASSERT( eTaskGetState( xHighPriorityMutexTask ) == eBlocked );
        }
    #endif /* INCLUDE_eTaskGetState */

    /* This task should now have inherited the priority of the high priority
     * task as by now the high priority task will have attempted to obtain the
     * mutex. */
    if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Now unsuspend the medium priority task.  This should not run as the
     * inherited priority of this task is above that of the medium priority
     * task. */
    vTaskResume( xMediumPriorityMutexTask );

    /* If the medium priority task did run then it will have incremented the
     * guarded variable. */
    if( ulGuardedVariable != 0 )
    {
        xErrorDetected = pdTRUE;
    }

    /* Take the local mutex too, so two mutexes are now held. */
    if( xSemaphoreTake( xLocalMutex, intsemNO_BLOCK ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    /* When the local semaphore is given back the priority of this task should
     * not yet be disinherited because the shared mutex is still held.  This is a
     * simplification to allow FreeRTOS to be integrated with middleware that
     * attempts to hold multiple mutexes without bloating the code with complex
     * algorithms.  It is possible that the high priority mutex task will
     * execute as it shares a priority with this task. */
    if( xSemaphoreGive( xLocalMutex ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    #if configUSE_PREEMPTION == 0
        taskYIELD();
    #endif

    /* The guarded variable is only incremented by the medium priority task,
     * which still should not have executed as this task should remain at the
     * higher priority, ensure this is the case. */
    if( ulGuardedVariable != 0 )
    {
        xErrorDetected = pdTRUE;
    }

    if( uxTaskPriorityGet( NULL ) != genqMUTEX_HIGH_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }

    /* Now also give back the shared mutex, taking the held count back to 0.
     * This time the priority of this task should be disinherited back to the
     * priority at which it was created.  This means the medium priority task
     * should execute and increment the guarded variable.  When this task next runs
     * both the high and medium priority tasks will have been suspended again. */
    if( xSemaphoreGive( xMutex ) != pdPASS )
    {
        xErrorDetected = pdTRUE;
    }

    #if configUSE_PREEMPTION == 0
        taskYIELD();
    #endif

    /* Check the guarded variable did indeed increment... */
    if( ulGuardedVariable != 1 )
    {
        xErrorDetected = pdTRUE;
    }

    /* ... and that the priority of this task has been disinherited to
     * genqMUTEX_LOW_PRIORITY. */
    if( uxTaskPriorityGet( NULL ) != genqMUTEX_LOW_PRIORITY )
    {
        xErrorDetected = pdTRUE;
    }
}
/*-----------------------------------------------------------*/

static void prvLowPriorityMutexTask( void * pvParameters )
{
    SemaphoreHandle_t xMutex = ( SemaphoreHandle_t ) pvParameters, xLocalMutex;

    #ifdef USE_STDIO
        void vPrintDisplayMessage( const char * const * ppcMessageToSend );

        const char * const pcTaskStartMsg = "Mutex with priority inheritance test started.\r\n";

        /* Queue a message for printing to say the task has started. */
        vPrintDisplayMessage( &pcTaskStartMsg );
    #endif

    /* The local mutex is used to check the 'mutex held' count. */
    xLocalMutex = xSemaphoreCreateMutex();
    configASSERT( xLocalMutex );

    for( ; ; )
    {
        /* The first tests exercise the priority inheritance when two mutexes
         * are taken then returned in a different order to which they were
         * taken. */
        prvTakeTwoMutexesReturnInDifferentOrder( xMutex, xLocalMutex );

        /* Just to show this task is still running. */
        ulLoopCounter2++;

        #if configUSE_PREEMPTION == 0
            taskYIELD();
        #endif

        /* The second tests exercise the priority inheritance when two mutexes
         *  are taken then returned in the same order in which they were taken. */
        prvTakeTwoMutexesReturnInSameOrder( xMutex, xLocalMutex );

        /* Just to show this task is still running. */
        ulLoopCounter2++;

        #if configUSE_PREEMPTION == 0
            taskYIELD();
        #endif

        #if ( INCLUDE_xTaskAbortDelay == 1 )
            {
                /* Tests the behaviour when a low priority task inherits the
                 * priority of a high priority task only for the high priority task to
                 * timeout before obtaining the mutex. */
                prvHighPriorityTimeout( xMutex );
            }
        #endif
    }
}
/*-----------------------------------------------------------*/

static void prvMediumPriorityMutexTask( void * pvParameters )
{
    ( void ) pvParameters;

    for( ; ; )
    {
        /* The medium priority task starts by suspending itself.  The low
         * priority task will unsuspend this task when required. */
        vTaskSuspend( NULL );

        /* When this task unsuspends all it does is increment the guarded
         * variable, this is so the low priority task knows that it has
         * executed. */
        ulGuardedVariable++;
    }
}
/*-----------------------------------------------------------*/

static void prvHighPriorityMutexTask( void * pvParameters )
{
    SemaphoreHandle_t xMutex = ( SemaphoreHandle_t ) pvParameters;

    for( ; ; )
    {
        /* The high priority task starts by suspending itself.  The low
         * priority task will unsuspend this task when required. */
        vTaskSuspend( NULL );

        /* When this task unsuspends all it does is attempt to obtain the
         * mutex.  It should find the mutex is not available so a block time is
         * specified. */
        if( xSemaphoreTake( xMutex, portMAX_DELAY ) != pdPASS )
        {
            /* This task would expect to obtain the mutex unless its wait for
             * the mutex was aborted. */
            if( xBlockWasAborted == pdFALSE )
            {
                xErrorDetected = pdTRUE;
            }
            else
            {
                xBlockWasAborted = pdFALSE;
            }
        }
        else
        {
            /* When the mutex is eventually obtained it is just given back before
             * returning to suspend ready for the next cycle. */
            if( xSemaphoreGive( xMutex ) != pdPASS )
            {
                xErrorDetected = pdTRUE;
            }
        }
    }
}
/*-----------------------------------------------------------*/


/* This is called to check that all the created tasks are still running. */
BaseType_t xAreGenericQueueTasksStillRunning( void )
{
    static uint32_t ulLastLoopCounter = 0, ulLastLoopCounter2 = 0;

    /* If the demo task is still running then we expect the loop counters to
     * have incremented since this function was last called. */
    if( ulLastLoopCounter == ulLoopCounter )
    {
        xErrorDetected = pdTRUE;
    }

    if( ulLastLoopCounter2 == ulLoopCounter2 )
    {
        xErrorDetected = pdTRUE;
    }

    ulLastLoopCounter = ulLoopCounter;
    ulLastLoopCounter2 = ulLoopCounter2;

    /* Errors detected in the task itself will have latched xErrorDetected
     * to true. */

    return ( BaseType_t ) !xErrorDetected;
}
